Phase diagrams of the blume-emery-griffiths thin films
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| Natura: | Artículo científico |
| Lingua: | en |
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Sociedade Brasileira de Física
2006
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| _version_ | 1876471506977947648 |
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| author | H. Ez-Zahraouy |
| author_facet | H. Ez-Zahraouy |
| contents | Phase diagrams of the blume-emery-griffiths thin films H. Ez-Zahraouy L. Bahmad A. Benyoussef Física, Astronomía y Matemáticas Two Thin films Phase diagrams sublattice BEG model Multicritical behaviour We study the spin-1 Blume-Emery-Griffiths model with bilinear and biquadratic exchange interactions andsingle-ion crystal field, using the mean field theory. In addition to the four usual phases: The disordered phaseD, the ferromagnetic phase F, the staggered quadrupolar phase SQ and The ferrimagnetic phase I, we found twonew phases, in the case of a thin magnetic film, namely: the sublattice (A or B) non magnetic phase NM andthe global non magnetic phase G. These phases are studied, for each layer of the film in the temperature-crystalfield plane (T=J;D=J) for different film thicknesses. It is found that the ferrimagnetic and sublattice phasesare absent for a monolayer film. Whereas, these phases appear for increasing film thicknessses N ¸ 2. On theother hand, the thermal behaviour of the layer quadrupolar moments qA;qB and layer magnetisations mA;mBare investigated for negative values of the biquadratic coupling and crystal field. It is also shown that for fixedvalues of the biquadratic coupling, the temperature and the crystal field, each layer of the film can belong to adifferent phase. To illustrate this situation, an example is given for d=J = ¡1:5, D=J = ¡3:0 and T=J = 1:3. 2006 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46403615 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.2B Vol.36 |
| format | Artículo científico |
| id | redalyc_46403615 |
| institution | Redalyc |
| language | en |
| publishDate | 2006 |
| publisher | Sociedade Brasileira de Física |
| spellingShingle | Phase diagrams of the blume-emery-griffiths thin films H. Ez-Zahraouy Física, Astronomía y Matemáticas Two Thin films Phase diagrams sublattice BEG model Multicritical behaviour Phase diagrams of the blume-emery-griffiths thin films H. Ez-Zahraouy L. Bahmad A. Benyoussef Física, Astronomía y Matemáticas Two Thin films Phase diagrams sublattice BEG model Multicritical behaviour We study the spin-1 Blume-Emery-Griffiths model with bilinear and biquadratic exchange interactions andsingle-ion crystal field, using the mean field theory. In addition to the four usual phases: The disordered phaseD, the ferromagnetic phase F, the staggered quadrupolar phase SQ and The ferrimagnetic phase I, we found twonew phases, in the case of a thin magnetic film, namely: the sublattice (A or B) non magnetic phase NM andthe global non magnetic phase G. These phases are studied, for each layer of the film in the temperature-crystalfield plane (T=J;D=J) for different film thicknesses. It is found that the ferrimagnetic and sublattice phasesare absent for a monolayer film. Whereas, these phases appear for increasing film thicknessses N ¸ 2. On theother hand, the thermal behaviour of the layer quadrupolar moments qA;qB and layer magnetisations mA;mBare investigated for negative values of the biquadratic coupling and crystal field. It is also shown that for fixedvalues of the biquadratic coupling, the temperature and the crystal field, each layer of the film can belong to adifferent phase. To illustrate this situation, an example is given for d=J = ¡1:5, D=J = ¡3:0 and T=J = 1:3. 2006 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46403615 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.2B Vol.36 |
| title | Phase diagrams of the blume-emery-griffiths thin films |
| topic | Física, Astronomía y Matemáticas Two Thin films Phase diagrams sublattice BEG model Multicritical behaviour |
| url | https://www.redalyc.org/articulo.oa?id=46403615 |